单项选择题

若潮气量为500 mL,呼吸频率为12次／分钟，则肺泡通气量（每分钟）接近
A、3 L
B、4 L
C、5 L
D、5. 5 L
E、6 L

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尊称老大哥管着出租车（《工会法》一句）

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单项选择题

Credit migration risk is best described as the risk that a bond (‘s):

A．yield spread may increase.
B．creditworthiness may decline.
C．issuer is unable to make interest and principal payments on a timely basis.
D．空